autonomic nervous system vs autonomic ganglion

autonomic nervous system and autonomic ganglion both are nouns.

Word	Noun	Adjective	Verb	Adverb
autonomic nervous system	Yes	No	No	No
autonomic ganglion	Yes	No	No	No

autonomic nervous system (noun)	autonomic ganglion (noun)
the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands	any of the ganglia of the autonomic system whose unmyelinated fibers innervate the internal organs